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MORTGAGE BANKING OPERATIONS - (Tables)
 3 Months Ended
Mar. 31, 2022
Mortgage Banking [Abstract]  
Mortgage Loans on Real Estate, by Loan
LHFS consisted of the following:
 
(in thousands)At March 31, 2022At December 31, 2021
Single family$48,994 $128,041 
CRE, multifamily and SBA10,156 48,090 
Total$59,150 $176,131 

Loans sold consisted of the following for the periods indicated: 

 Quarter Ended March 31,
(in thousands)20222021
Single family$323,070 $573,040 
CRE, multifamily and SBA49,137 257,717 
Total$372,207 $830,757 
Net Gain on Loan Origination and Sale Activity
Gain on loan origination and sale activities, including the effects of derivative risk management instruments, consisted of the following: 

 Quarter Ended March 31,
(in thousands)20222021
Single family$6,169 $26,187 
CRE, multifamily and SBA2,105 7,272 
Total$8,274 $33,459 
Company's Portfolio of Loans Serviced for Others
The Company's portfolio of loans serviced for others is primarily comprised of loans held in U.S. government and agency MBS issued by Fannie Mae, Freddie Mac and Ginnie Mae. The unpaid principal balance of loans serviced for others is as follows:


(in thousands)At March 31, 2022At December 31, 2021
Single family $5,545,145 $5,539,180 
CRE, multifamily and SBA 2,035,801 2,031,087 
Total$7,580,946 $7,570,267 
Mortgage Repurchase Losses
The following is a summary of changes in the Company's liability for estimated single-family mortgage repurchase losses:

 Quarter Ended March 31,
(in thousands)20222021
Balance, beginning of period$1,312 $2,122 
Additions, net of adjustments (1)
358 (20)
Realized (losses) recoveries, net (2)
(32)(161)
Balance, end of period$1,638 $1,941 
(1) Includes additions for new loan sales and changes in estimated probable future repurchase losses on previously sold loans.
(2) Includes principal losses and accrued interest on repurchased loans, "make-whole" settlements, settlements with claimants and certain related expenses.
Revenue from Mortgage Servicing, Including the Effects of Derivative Risk Management Instruments
Revenue from mortgage servicing, including the effects of derivative risk management instruments, consisted of the following:

 Quarter Ended March 31,
(in thousands)20222021
Servicing income, net:
Servicing fees and other$8,321 $8,913 
Amortization of single family MSRs (1)
(3,425)(5,693)
Amortization of multifamily and SBA MSRs(1,712)(1,344)
Total
3,184 1,876 
Risk management, single family MSRs:
Changes in fair value of MSRs due to assumptions (2)
10,303 11,463 
Net gain (loss) from economic hedging (10,183)(12,591)
Total
120 (1,128)
               Loan servicing income (loss)$3,304 $748 
(1) Represents changes due to collection/realization of expected cash flows and curtailments.
(2) Principally reflects changes in model assumptions, including prepayment speed assumptions, which are primarily affected by changes in mortgage interest rates.
Changes in Single Family MSRs Measured at Fair Value The changes in single family MSRs measured at fair value are as follows:
Quarter Ended March 31,
(in thousands)20222021
Beginning balance$61,584 $49,966 
Additions and amortization:
Originations
3,916 6,616 
Amortization (1)
(3,425)(5,693)
Net additions and amortization
491 923 
Changes in fair value assumptions (2)
10,303 11,463 
Ending balance$72,378 $62,352 
(1) Represents changes due to collection/realization of expected cash flows and curtailments.
(2) Principally reflects changes in model assumptions, including prepayment speed assumptions, which are primarily affected by changes in mortgage interest rates.
Key Economic Assumptions Used in Measuring Initial FV of Capitalized Single Family MSRs
Key economic assumptions used in measuring the initial fair value of capitalized single family MSRs were as follows: 

Quarter Ended March 31,
(rates per annum) (1)
20222021
Constant prepayment rate ("CPR") (2)
9.38 %8.37 %
Discount rate 8.34 %8.37 %
(1) Based on a weighted average.
(2) Represents an expected lifetime average CPR used in the model.
Schedule of Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets
For single family MSRs, we use a discounted cash flow valuation technique which utilizes CPRs and discount rates as significant unobservable inputs as noted in the table below:

At March 31, 2022At December 31, 2021
Range of Inputs
Average (1)
Range of Inputs
Average (1)
CPRs
7.38% - 16.66%
9.42 %
7.90% - 17.35%
10.35 %
Discount Rates
8.10% - 15.18%
9.05 %
6.94% - 13.96%
7.97 %
(1) Weighted averages of all the inputs within the range.
To compute hypothetical sensitivities of the value of our single family MSRs to immediate adverse changes in key assumptions, we computed the impact of changes to CPRs and in discount rates as outlined below:

(dollars in thousands)At March 31, 2022
Fair value of single family MSR$72,378 
Expected weighted-average life (in years)7.14
CPR
Impact on fair value of 25 basis points adverse change in interest rates$(2,208)
Impact on fair value of 50 basis points adverse change in interest rates$(4,909)
Discount rate
Impact on fair value of 100 basis points increase$(3,217)
Impact on fair value of 200 basis points increase$(6,187)
Changes in Multifamily MSRs Measured at the Lower of Amortized Cost or Fair Value
The changes in multifamily and SBA MSRs measured at the lower of amortized cost or fair value were as follows: 

Quarter Ended March 31,
(in thousands)20222021
Beginning balance$39,415 $35,774 
Originations1,576 5,196 
Amortization(1,712)(1,344)
Ending balance$39,279 $39,626